Wang PC

Personal computers made by Wang Laboratories.
Wang's PCs had an operating system (based on MS-DOS) which
was not compatible with the IBM PC. The Wang floppy disk
format was compatible with the IBM PC. However, running an
IBM "exe" program would generally crash a Wang PC unless a
special Industry-Standard emulator program was running on the
Wang. This program required the addition of a special card to
the Wang PC. It enabled the Wang PC to run most, but not all,
software written for the IBM PC. Most Wang software made use
of two special keys: CANCEL and EXECUTE. These keys were used
to carry out commands, make menu selections, and so on. The
Wang OS was menu-driven.